Fix html_viewer Windows build after r327559

mojo/shell/native_runner.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_SHELL_NATIVE_RUNNER_H_
 #define MOJO_SHELL_NATIVE_RUNNER_H_
 
 #include "base/callback_forward.h"
 #include "base/memory/scoped_ptr.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
 #include "mojo/public/interfaces/application/application.mojom.h"
 
+#if defined(OS_WIN)
+#undef DELETE
+#endif
+
 namespace base {
 class FilePath;
 }
 
 namespace mojo {
 namespace shell {
 
 enum class NativeApplicationCleanup { DELETE, DONT_DELETE };
 
 // ApplicationManager requires implementations of NativeRunner and
@@ skipping 27 matching lines @@
   };
 
   virtual ~NativeRunnerFactory() {}
   virtual scoped_ptr<NativeRunner> Create(const Options& options) = 0;
 };
 
 }  // namespace shell
 }  // namespace mojo
 
 #endif  // MOJO_SHELL_NATIVE_RUNNER_H_